Splitting Oracle Datafiles

Is it possible to split an OLAP tablespace over multiple datafiles?

How would one go about splitting a 300GB database file into 16GB Chunks, could I use a variation of the below process? 

CREATE TABLESPACE glo DATAFILE

   'disk1/oradata/glo1.dbf' SIZE 64M REUSE AUTOEXTEND ON NEXT 8M MAXSIZE 1024M
   EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO;

ALTER TABLESPACE glo ADD DATAFILE 
   'disk2/oradata/glo2.dbf' SIZE 64M REUSE AUTOEXTEND ON NEXT 8M MAXSIZE 1024M,
   'disk3/oradata/glo3.dbf' SIZE 64M REUSE AUTOEXTEND ON NEXT 8M MAXSIZE UNLIMITED; 

The reason I ask is for backup performance, it is much quicker to backup multiple 16GB files (since it can be run parallel) then one 300GB file.